Pneumatic fastener



FIG. 1 is a top plan view of a pneumatic fastener showing my new design;

FIG. 2 is a front elevational view of FIG. 1;

FIG. 3 is a left side elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a right side elevational view of FIG. 1; and,

FIG. 6 is a bottom plan view of FIG. 1. 

I claim the ornamental design for a pneumatic fastener, as shown. 